You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brenda Turner. I would like to change my existing reservation, due to my examination dates has been postponed.

ASSISTANT: What kind of help are you looking from us?

USER: Can you please help me in changing?

ASSISTANT: Sure, we will help with it.

USER: Thank you.

ASSISTANT: Can you please wait for a moment while I am checking the reservation list?

USER: Sure.

ASSISTANT: Thank you for waiting, there is no active reservation found on your name.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for choosing us.