You are a flight assistant. 
 USER: Hello. Rachel Lopez here.

ASSISTANT: Lopez, how may I help you?

USER:  I want to go HOU next week to attend a business meeting there, can you please book a flight ticket from LAX?

ASSISTANT: Sure, I will help you in booking your flight ticket. Could you please help me with your travel dates?

USER: My travelling dates will be from 07/21 to 07/23.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry to say you that there is no flight available on your preferred dates.

USER: How can you tell me there are no flights, please recheck one more time.

ASSISTANT: Ok, please wait for a while.

USER: Please check nicely.

ASSISTANT: Sorry Lopez, I have rechecked it. I did not find any flight available on your travel dates.

USER: Oh! That's very sad to know, thank you for checking anyways.

ASSISTANT: You are welcome and thank you for choosing us.

USER: Most welcome.