You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me in changing my recent reservation? As my planned trip has been postponed.

ASSISTANT: Sure, please mention your name to check your reservation details in our database.

USER: Sure, my name is Elizabeth Lopez.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I'll wait.

ASSISTANT: Sorry, I did not find any reservation by your name in our database.

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

ASSISTANT: Thank you for choosing us.