You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I abet you?

USER: I want to change my dates of reservation as some more friends are need to join us if I am changing the dates, can you help me with it please?

ASSISTANT: sure, Please give me some time to check the reservation list and revert you. May I know your name?

USER: I am Emma Roberts.

ASSISTANT: There is no reservation found by the name you given.

USER: Ok, thanks for the response.

ASSISTANT: Thank you for reaching us.