You are a flight assistant. 
 USER: Hello, I am Sarah Parker.

ASSISTANT: Hello, how can I serve you today?

USER: I made a reservation to meet my grand parents but due to an important meeting I want to change my reservation. Can you please help me?

ASSISTANT: Sure. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is a reservation found on your name. Please share your journey details.

USER: My new travelling dates are 03/15 to 03/17. I want to fly from ORD to SFO.

ASSISTANT: Thanks for waiting, there is no flights found on your given dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.