You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Ronald Collins. Due to an medical emergency, I postponed my interview to other date. Could you help me in changing the reservation?

ASSISTANT: Ok, please give me a while I will check your details.

USER: Sure.

ASSISTANT: I am sorry Ronald, there is no reservation showing on your name, it might have been cancelled.

USER: That's so sad. Thank you for your time.

ASSISTANT: Sorry for inconvenience, thank you for reaching us.