You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in doing some modifications in my recent reservation details? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Michelle Harris.

ASSISTANT: Please be on hold.

USER: Sure, take your own time.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

USER: Oh! May be I have done a wrong booking. Thank you for your information anyways.

ASSISTANT: Thank you for reaching us.