You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Betty Robinson here.

ASSISTANT: How may I guide you?

USER: Due to sudden change in my planned dates of journey, I would like to change my reservation. Can you please help me out that?

ASSISTANT: Ok, I can help you with that.

USER: Thank you.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found with your name in our database.

USER: Oh! I think the ticket was not booked properly while I am booking. Anyway, thank you for the information.

ASSISTANT: Thank you for choosing us.