You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you aid me book my ticket from LAX to IAH?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travel dates are May 21 and May 23 respectively.

ASSISTANT: Do you have any preferences about flight connections?

USER: Make sure that connection limit is single. I prefer to travel in afternoon for my return journey.

ASSISTANT: Do you have any preferences about class?

USER: No class preferences for me.

ASSISTANT: Please mention your name.

USER: Mary Wilson here.

ASSISTANT: There are no flights found under your preferable details.

USER: Ok, no issue. Thank you.

ASSISTANT: Thanks for reaching us, have a great day.