You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: Myself Ruth Hernandez. Can you please book a flight ticket from IAH to LGA?

ASSISTANT: Sure, I am here to help you with the ticket booking. Can I have your planned trip dates?

USER: Sure, I need to travel on dates of 09/16 and 09/18.

ASSISTANT: Sorry to inform you, there are no flights running in this route on the dates you have given.

USER: That's ok fine, no problem. Anyway, thank you for your time.

ASSISTANT: That's my pleasure. Thank you for reaching us. Have a nice day.