You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you today?

USER: Due to my ill health, I would like to cancel my recent reservation to Dallas. Will you help me with this?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Let me know your name to check your reservation?

USER: My name is Emily Walker.

ASSISTANT: Ok, Please wait a while.

USER: Sure, I will wait for your information.

ASSISTANT: Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: Oh! That seems something went wrong while booking the ticket previously. Anyways, thank you for providing information.

ASSISTANT: Thank you for choosing us.