You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, I can help you. May I know your name to cancel your ticket?

USER: Sure, my name is Sarah Martin.

ASSISTANT: Sarah, please give me a moment to check your ticket status.

USER: Sure, I will wait.

ASSISTANT: Sorry, no reservation is available by your name.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for contacting us.