You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. do you need any help from us?

USER: I have to modify my travel details in the previous ticket because the planned trip is postponed. Can you please help me in changing the details?

ASSISTANT: Sure, could I have your name please?

USER: Thank you for considering my request. My name is Cynthia Johnson.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes.

USER: It's ok, not a problem with that. Thank you for searching the ticket status.

ASSISTANT: You are welcome.