You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Helen Allen here.

ASSISTANT: How may I assist you?

USER: Can you please book a flight ticket from LGA to HOU?

ASSISTANT: Yes, can you please share your travelling dates?

USER: Sure, I need to travel on dates of 01/27 and 01/29.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights found on your requested dates.

USER: It's ok fine. Thank you for your time.

ASSISTANT: Thank you for reaching us.