You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to visit Spruce Street harbour which is at Philadelphia, So help me with booking flight ticket?

ASSISTANT: Sure, could you please mention your airport codes?

USER: Ok, I want to board from Las Vegas, NV - LAS to reach PA - PHL, Philadelphia.

ASSISTANT: Ok, when you are planning your journey?

USER: On 09/17, I want to start on Las Vegas and I will return on 09/19.

ASSISTANT: Ok, may I have your name please?

USER: Alexander Martin, is my name.

ASSISTANT: What is your budget for a ticket fare?

USER: My budget for my ticket is only 200.

ASSISTANT: OK, please wait.

USER: Sure, make it fast.

ASSISTANT: Thanks for waiting, no flights are flying on your requested dates.

USER: Ok, I will try to reach on another day. Anyway, Thanks for your response.

ASSISTANT: Thank you for choosing us.