You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Donald Thomas. I am planning to attend a birthday party of my friend in SFO, can you help me in booking a ticket from LGA?

ASSISTANT: Sure, can you please share your travel dates?

USER: My planning dates are from 12/13 to 12/15.

ASSISTANT: Let me check for the availability of flight.

USER: Ok, take your time.

ASSISTANT: Donald, I am sorry to inform you that there is no flight available at your requested dates.

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

ASSISTANT: Thank you for contacting us.

USER: You are welcome.