You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jason Mitchell.

ASSISTANT: Jason, how may I aid you?

USER: Due to my ill health, I would like to postpone my trip. Will you please help me by changing my existing reservation?

ASSISTANT: Sure, I am here to help you. Please give me a moment to check your ticket status.

USER: Sure, I will wait for your response.

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

USER: Ok, not an issue. May be something went wrong while booking the ticket previously. Anyways, thank you for providing information.

ASSISTANT: Thank you for choosing us.