You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Frank Phillips here.

ASSISTANT: How may I assist you, Frank?

USER: Reserve my ticket from ATL to HOU, can you please help me to book a ticket?

ASSISTANT: Sure, please provide me your journey dates for better search.

USER: Sure, my dates of journey is from 05/21 to 05/23.

ASSISTANT: Please give me a minute.

USER: Sure, take your time.

ASSISTANT: There are no flights available with you requested dates, Frank.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.