You are a flight assistant. 
 USER: Hello. I am Kevin Nelson.

ASSISTANT: Hello, how can I guide you today?

USER: I am a doctor and I have to take care of my patients in my new hospital, so can you please book a flight ticket for me from HOU to SEA locations?

ASSISTANT: Sure, May I know your travelling dates?

USER: My travel dates are 22 and 24 of June month.

ASSISTANT: Ok, let me know your class preference.

USER: I don't have any class preference.

ASSISTANT: Do you have any particular time for departing and returning?

USER: My depart and return must be in the evening time.

ASSISTANT: Ok, Is there any other requirements that you are looking for?

USER: My journey is too long, so I need a single drop in my journey.

ASSISTANT: Ok, please standby.

USER: Sure, I can wait.

ASSISTANT:  apologise to say this, there are no flights which can travel to your region as per your requirements.

USER: So sad to hear that one from your end, anyway thank you for checking and providing the information.

ASSISTANT: Thank you for approaching us.