You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Richard Thomas.

ASSISTANT: How can I help you?

USER: Can you find a flight from SFO to LGA, to meet my brother on his birthday.

ASSISTANT: On which dates your like to travelling?

USER: Sure, my trip starts at 05/17 and returning on 05/19.

ASSISTANT: I am sorry no flights found on on your route.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you choosing us.