You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to change my recent reservation, can you please check with that?

ASSISTANT: Sure, may I know your name?

USER: Myself Stephanie Smith.

ASSISTANT: Please wait.

USER: Ok, I will be waiting.

ASSISTANT: Your reservation found, may I know your specifications?

USER: I need a direct flight with the airport codes SFO and PHL.

ASSISTANT: Please share your trip dates?

USER: My new travelling dates are Aug,09 and Aug,11.

ASSISTANT: Do you prefer any specifications?

USER: No.

ASSISTANT: Sorry, no flights found on your route due to bad weather conditions.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you.