You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Ruth Roberts here.

ASSISTANT: Good morning Ruth. How can I assist you at this moment?

USER: I need a reservation on the dates from 05/31 to 06/02 for enjoying my holidays, can you help me with booking?

ASSISTANT: Sure, I am ready to help you with booking. Can I have your airport codes please?

USER: My airport codes will be from  PHL to SFO.

ASSISTANT: Ok, please wait a moment to check for flight availability.

USER: Ok, let me know if the price is within 200 only.

ASSISTANT: Thank you for your patience. Sorry to inform you that no airlines is running a flight in your route on your dates.

USER: Ok, no issues.Thank you for your assistance.

ASSISTANT: Most welcome. Thank you for choosing us.

USER: Most welcome.