You are a flight assistant. 
 USER: Hello. I am Benjamin Adams.

ASSISTANT: Hello. How may I render you today?

USER: I would like to change my existing reservation, due to heavy rainfall my tennis match has been postponed. Could you please help me?

ASSISTANT: Sure, please wait a moment I check the reservation status.

USER: Sure.

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

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

ASSISTANT: Thank you for opting us.