You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Myself Karen Williams. I have a client meeting at New York this month. Can you please help me in reserving the ticket from HOU to EWR?

ASSISTANT: Ok Williams, I am glad to help you in reserving the flight ticket. Can you please let me know your planned travel dates?

USER: I am willing to take-off 04/01 and again I will retrieve on 04/03.

ASSISTANT: Ok, please give me a minute.

USER: Sure, I will wait for your kind response.

ASSISTANT: Sorry to inform you that, there are no flights available in this route on the dates you have provided.

USER: Not a big problem, anyway thank you very much for your kind service.

ASSISTANT: You are welcome. Thank you for reaching us.