You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am unable to catch the flight on the departure date because I have to attend an important meeting. So, I have to change the travel dates. Can you please help me?

ASSISTANT: Sure, please mention your name for checking the reservation.

USER: Thank you. My name is Samantha Scott.

ASSISTANT: Please give me a moment.

USER: Ok, take your own time.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: Oh! That's sad to hear from our side. Anyways thank you for helping me.

ASSISTANT: Welcome, have a great day.