have simple phonebook in dict numbers bob 213718293 12389123 ivan 1823

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I have a simple phonebook in dict:
numbers = {
'bob' : ['+213718293','+12389123'],
'ivan' : ['+1823128312','+238912793'],
'elena' : ['+1982389123','+2389712893'],
'olga' : ['+9238217839'],
'mark' : ['+2138912783','+12838912'],
}
The list of people that i'm looking for:
people = ['bob','elena','mark']
In result I want to get phone numbers coma separeted in one srting:
mynumbers = "+213718293,+12389123,+1982389123,+2389712893,+2138912783,+12838912"