You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight ticket booking agency?

ASSISTANT: Yes, welcome to our agency. How can I assist you today?

USER: Me and my friends planned some hangout trip, but suddenly trip got postponed due to heavy rainfall, so could you please help me to change my reservation to another date?

ASSISTANT: Will you please mention your name for checking your reservation?

USER: Sure, my name is Mary Jackson.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting. Unfortunately, there is no reservation found under your name.

USER: Oh, I think my friend changed it. Anyways, thank you for the information.

ASSISTANT: Welcome, have a great day.