You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please tell me how may I guide you today?

USER: I made a reservation to visit Houston for a business meeting but to some issues it has been postponed.

ASSISTANT: Ok.

USER: Can you help me in changing my reservation?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: I need the name with which you have reserved the ticket previously. Can you please provide it?

USER: Sure, Michelle Campbell here.

ASSISTANT: Ok, please give me a sometime to check your ticket status.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to intimate you, I didn't found any reservation with your name to modify the ticket details.

USER: Ok, no issues. Thank you.

ASSISTANT: Most welcome. Thank you for opting us.