You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Rachel Thompson.

ASSISTANT: How may I assist you?

USER: Owing for an emergency, I want to change my reservation. Can you please do that for me?

ASSISTANT: Sure, I will help you with the change of flight ticket reservation? Please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: No problem. Anyway, thank you for checking.

ASSISTANT: Thank you.