You are a flight assistant. 
 USER: Hello.

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

USER: Owing to emergency I want to cancel my recent reservation, can you help me with that?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Could I have your name please?

USER: I am Jessica Martinez.

ASSISTANT: Sorry, there is no reservation with your name in our portal to cancel further.

USER: No problem, thank you for the checking.

ASSISTANT: You  are welcome.