You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Jessica Mitchell here, I want to update my trip dates to visit Washington as I my leave has not been issued yet. Can you help me?

ASSISTANT: Sure, we are help to help you in changing the previous reservation. Please wait for a while.

USER: Sure.

ASSISTANT: There is no reservation made previously on your name.

USER: Ok fine.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your assistance.