You are a flight assistant. 
 USER: Hi, I am Nancy Johnson.

ASSISTANT: Hello, how can I be your helping hand?

USER: Can you book a flight ticket with a fare of 5000?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: May I know, from where you want to board?

USER: I will depart from SEA.

ASSISTANT: Help me with your travelling dates please.

USER: Travelling dates are 09/15 and 09/17.

ASSISTANT: Do you have price limit?

USER: Yes.

ASSISTANT: May I know your landing airport code?

USER: I have to reach Houston, HOU to visit the historical places.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. Unfortunately, there are no flights available with your requirements.

USER: Ok, Thank you.

ASSISTANT: Thank you for reaching us.