You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Sarah Wright.

ASSISTANT: How can I help you?

USER: I want to book a flight from SFO to PHL to meet my friend, can you please help me to book a direct flight?

ASSISTANT: Sure. May I know your travelling dates?

USER: My trip dates are 02/18 to 02/20.

ASSISTANT: Is there any price limit?

USER: My price is 200.

ASSISTANT: There is no direct flight available to your destination.

USER: Ok, no issues. Thanks for your help.

ASSISTANT: Thank you.