You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Shirley King here.

ASSISTANT: What help that I can do for you?

USER: Can you please help me in changing my recent reservation? As my health is not in a good condition to do journeys right now.

ASSISTANT: Sure, I can help you  in changing the ticket details. Can you please wait a minute?

USER: Sure, I'll wait for your response.

ASSISTANT: I am really sorry to inform you, I have not found any reservation under your name to change the details.

USER: Oh! May be something went wrong while I was booking the ticket, I'll recheck it once and get back to you. Thank you anyways.

ASSISTANT: You are welcome. Thank you for reaching us.