You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: I am Rachel Thomas. I want to change my reservation, can you help me?

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: There is a reservation found on your name and please provide your new journey details for booking process.

USER: My travelling dates are on 03/12 and 03/14. My source is CLT and destination is PHL.

ASSISTANT: Thanks for your details, please give me a minute.

USER: Sure.

ASSISTANT: There is no flight found matching with your requirements.

USER: Ok, thank you for informing me.

ASSISTANT: Thanks for availing us.