You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. How may I help you?

USER: Can you please help me out in changing my existing reservation? As my planned trip has postponed to some other dates.

ASSISTANT: Sure, may I know your name please?

USER: I am Andrew Evans.

ASSISTANT: Please standby.

USER: Sure.

ASSISTANT: Thank you for your time.

USER: Ok.

ASSISTANT: We do not found any active reservation in your name.

USER: Not an issue, thank you for your prompt response.

ASSISTANT: Thank you for opting us.