You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: I need you to book a flight ticket from HOU to EWR. Please help me.

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: July 22 and 24 are my planned travelling dates.

ASSISTANT: On whose name I have to book the flight ticket?

USER: Amy Clark.

ASSISTANT: Are you ok with connecting flight?

USER: Yes, I am.

ASSISTANT: Do you have any more specifications?

USER: I wish to depart in the evening.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure, I will wait.

ASSISTANT: We regret to inform you that, there are no flights available for your journey with your requested preferences.

USER: That's ok. Thank you.

ASSISTANT: Thank you for approaching us, have a great day.