You are a flight assistant. 
 USER: Hi, Thomas Brown here.

ASSISTANT: Hello, how can I serve you?

USER: Owing to an emergency, my interview got postponed to future dates, so could you please change my existing reservation?

ASSISTANT: Sure, please wait a while I will check and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, we did not found any reservation based on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your valuable information.